Controlling device for electric motors



(No Model.

I. O. BLACKWELL. CONTROLLING DEVICE FOR ELECTRIC MOTORS.

Patented Nov. '3, 1891.

+ Ix/ e: har- UNITED STATES FRANCIS O. BLACIUVELL, OF NE\V YORK, N. Y., ASSIGNOR TO THE "IIOMSON- PATENT OEETQE.

HOUSTON ELECTRIC COMPANY, OF CONNECTICUT.

CONTROLLING DEVICE FOR ELECTRIC MOTORS.

SPEOIFICA TION forming part of Letters Patent No. 462,869, dated November 3, 1891.

Application filed July 13, 1889. Serial No. 317,374. (No model.)

To all whom it nay concern:

Be itknown thatl, FRANCIS O. BLACKWELL, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Controlling Devices for Electric illotors, of which the following is a specification.

My invention relates to a controlling device for electric motors in which a motor is pro vided with means for controlling its speed, such as a resistance, and also with meansfor reversing its direction of movementfor example, a switch for reversing the direction of current, either in the armature or field.

My invention consists in providing a single lever or handle for operating both the controller and the reverser, a certain range of movement of the handle acting to work the controller, and a further movement acting, first, to reverse, and, secondly, to operate the controller.

My invention is illustrated in the accompanying drawing.

In the drawing, A represents the armature of the motor; B, the field-magnet; C, a controller-as, for example, a resistanceand D a reversing deviceas, for example, a switch changing the direction of current in the armature.

A common handle E for operating both the controller and the reverser is employed. This handle E is pivoted at a center F and has a total range of movement from a to b. Upon one side of center F a connecting-rod G extends to lever ll of resistance C. On the opposite side of center F is a pin K, extending into an elliptical-shaped opening in one end of lever L of the reverser. The elliptical-shaped opening of lever L has such a contour that while the operatinglever passes from c to d the ei'igagement of pin K with lever L operates the reversing-switch from one side to the other, while a further movement of E in either direction causes no further movement of lever L, but simply actuates the lever II to vary the resistance C. The lever E in the drawing is shown with the resistance partly out out. As it proceeds in its movement from Z) toward (Z it will actuate lever ll to bring in the whole of resistance C. lVhen passing from (Z to c itpasses over adead-center with regard to the resistance; but with regard to the reverser the stud K is in a position to throw the lever L from one side to the other, and thereby actuate the reversing-switch. A further movement of handle E from c to agivcs the lever ll exactly the same movement that it has when E is passing from a to b. Bythis arrangement only a single lever is necessary for the complete control of the motor, and but one resistance and one set of contacts, therefore, are essential.

It will be observed that no matter which way the handle E is thrown from its normal central position between the points 0 (Z it will move the lever H in the same direction, and

thus have a like regulating effect upon the motor-current, while the engagement of the pin K with the sides of the cam-opening in lever L will lock the reversing-switch against movement at all times, except when the actuating-handle passes its central position, thereby throwing the switch, as before described.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with an electric motor, of a current-controller and circuit-reverser therefor, a common actuator positively actu ating both, but allowing the controller a predetermined amount of lost movement relative to the reverser, for the purpose setforth.

2. The combination, with an electric motor, of a current controlling-switch, a circuit'reversing switch, a common pivoted actuator actuating both switches positively, aconnection between the actuator and the controllingswitch, such that the latter regulates the motor-current correspondingly upon movement of the actuator in opposite directions from a central position, and a lost-motion connection between the reversing-switch and actuator, whereby the former is thrown by the actuator only when passing its central position, as set forth.

3. The combination, with an electric motor, of a cirnit-reverser moving in opposite directions, respectively, when and for reversing the motor-circuit, a resistance or current-regulator controlled by a contact moving in a constant direction when increasing or decreasing the motor-current, and a common actuator with which both reverser and regulator are connected, as described.

4. The combination, with an electric motor, of a current-regulator and circuit-reverser, a common pivoted actuator therefor, andintermediate connections, such that movement of the actuator in opposite directions from a central position imparts movement to the re- Verser in opposite directions, but to the regulator in the same direction, as described.

5. The combination of an electric motor, a current-regulatorand circuit-reversingswitch in the motor-circuit, with acommon actuator connected positively with both, but allowed a predetermined amount of lost movement relatively to the reverser, and a locking device whereby the reverser is locked against movement except when the actuator is about to throw the same, as set forth.

6. The combination, with an electric motor, of a resistance, an actuating-handle therefor, an intermediate connection whereby the action of the handle upon opposite sides of the central point is duplicated, and a reversing switch actuated by the handle while passing the central position, the connections between reversing-switch and handle allowing a certain amount of lost movement, for the purpose described.

7. The combination, with an electric motor, of the resistance C in the motor-circuit, an operating-handle E, a reversing-switch D, a power connection G, whereby throwing the handle E upon opposite sides of a central position regulates the motor correspondingly, and a lever L, connected to the reversingswitch D and actuated by the handle E when passing over its central position, as set forth.

8. The combination, with an electric motor, of a resistance and reversing-switch therefor, a pivoted arm E, the lever L, provided with double cam-surfaces, the arm and lever being connected, respectively, with the resistance and circuit-reverser and operating them successively, as described.

FRANCIS O. BLAOKVVELL.

Witnesses: v

EDWARD M. BENTLEY, G. RENAULT. 

